gem5  v21.1.0.2
Public Types | Public Member Functions | Public Attributes | List of all members
gem5::ArmISA::TableWalker::L1Descriptor Class Reference

#include <table_walker.hh>

Inheritance diagram for gem5::ArmISA::TableWalker::L1Descriptor:
gem5::ArmISA::TableWalker::DescriptorBase

Public Types

enum  EntryType { Ignore, PageTable, Section, Reserved }
 Type of page table entry ARM DDI 0406B: B3-8. More...
 

Public Member Functions

 L1Descriptor ()
 Default ctor. More...
 
virtual uint64_t getRawData () const
 
virtual std::string dbgHeader () const
 
virtual uint8_t offsetBits () const
 
EntryType type () const
 
bool supersection () const
 Is the page a Supersection (16 MiB)? More...
 
Addr paddr () const
 Return the physcal address of the entry, bits in position. More...
 
Addr paddr (Addr va) const
 Return the physcal address of the entry, bits in position. More...
 
Addr pfn () const
 Return the physical frame, bits shifted right. More...
 
bool global (WalkerState *currState) const
 Is the translation global (no asid used)? More...
 
bool xn () const
 Is the translation not allow execution? More...
 
uint8_t ap () const
 Three bit access protection flags. More...
 
TlbEntry::DomainType domain () const
 Domain Client/Manager: ARM DDI 0406B: B3-31. More...
 
Addr l2Addr () const
 Address of L2 descriptor if it exists. More...
 
uint8_t texcb () const
 Memory region attributes: ARM DDI 0406B: B3-32. More...
 
bool shareable () const
 If the section is shareable. More...
 
void setAp0 ()
 Set access flag that this entry has been touched. More...
 
bool dirty () const
 This entry needs to be written back to memory. More...
 
bool secure (bool have_security, WalkerState *currState) const
 Returns true if this entry targets the secure physical address map. More...
 
- Public Member Functions inherited from gem5::ArmISA::TableWalker::DescriptorBase
 DescriptorBase ()
 

Public Attributes

uint32_t data
 The raw bits of the entry. More...
 
bool _dirty
 This entry has been modified (access flag set) and needs to be written back to memory. More...
 
- Public Attributes inherited from gem5::ArmISA::TableWalker::DescriptorBase
LookupLevel lookupLevel
 Current lookup level for this descriptor. More...
 

Detailed Description

Definition at line 98 of file table_walker.hh.

Member Enumeration Documentation

◆ EntryType

Type of page table entry ARM DDI 0406B: B3-8.

Enumerator
Ignore 
PageTable 
Section 
Reserved 

Definition at line 102 of file table_walker.hh.

Constructor & Destructor Documentation

◆ L1Descriptor()

gem5::ArmISA::TableWalker::L1Descriptor::L1Descriptor ( )
inline

Default ctor.

Definition at line 118 of file table_walker.hh.

References gem5::ArmISA::L1, and gem5::ArmISA::TableWalker::DescriptorBase::lookupLevel.

Member Function Documentation

◆ ap()

uint8_t gem5::ArmISA::TableWalker::L1Descriptor::ap ( ) const
inlinevirtual

Three bit access protection flags.

Implements gem5::ArmISA::TableWalker::DescriptorBase.

Definition at line 186 of file table_walker.hh.

References gem5::bits(), and data.

Referenced by gem5::ArmISA::TableWalker::doL1Descriptor().

◆ dbgHeader()

virtual std::string gem5::ArmISA::TableWalker::L1Descriptor::dbgHeader ( ) const
inlinevirtual

Implements gem5::ArmISA::TableWalker::DescriptorBase.

Definition at line 128 of file table_walker.hh.

◆ dirty()

bool gem5::ArmISA::TableWalker::L1Descriptor::dirty ( ) const
inline

This entry needs to be written back to memory.

Definition at line 229 of file table_walker.hh.

References _dirty.

◆ domain()

TlbEntry::DomainType gem5::ArmISA::TableWalker::L1Descriptor::domain ( ) const
inlinevirtual

◆ getRawData()

virtual uint64_t gem5::ArmISA::TableWalker::L1Descriptor::getRawData ( ) const
inlinevirtual

Implements gem5::ArmISA::TableWalker::DescriptorBase.

Definition at line 123 of file table_walker.hh.

References data.

◆ global()

bool gem5::ArmISA::TableWalker::L1Descriptor::global ( WalkerState currState) const
inlinevirtual

Is the translation global (no asid used)?

Implements gem5::ArmISA::TableWalker::DescriptorBase.

Definition at line 174 of file table_walker.hh.

References gem5::bits(), and data.

◆ l2Addr()

Addr gem5::ArmISA::TableWalker::L1Descriptor::l2Addr ( ) const
inline

Address of L2 descriptor if it exists.

Definition at line 198 of file table_walker.hh.

References data, and gem5::mbits().

Referenced by gem5::ArmISA::TableWalker::doL1Descriptor().

◆ offsetBits()

virtual uint8_t gem5::ArmISA::TableWalker::L1Descriptor::offsetBits ( ) const
inlinevirtual

Implements gem5::ArmISA::TableWalker::DescriptorBase.

Definition at line 133 of file table_walker.hh.

◆ paddr() [1/2]

Addr gem5::ArmISA::TableWalker::L1Descriptor::paddr ( ) const
inline

Return the physcal address of the entry, bits in position.

Definition at line 150 of file table_walker.hh.

References data, gem5::mbits(), panic, and supersection().

◆ paddr() [2/2]

Addr gem5::ArmISA::TableWalker::L1Descriptor::paddr ( Addr  va) const
inline

Return the physcal address of the entry, bits in position.

Definition at line 157 of file table_walker.hh.

References data, gem5::mbits(), panic, supersection(), and gem5::ArmISA::va.

◆ pfn()

Addr gem5::ArmISA::TableWalker::L1Descriptor::pfn ( ) const
inlinevirtual

Return the physical frame, bits shifted right.

Implements gem5::ArmISA::TableWalker::DescriptorBase.

Definition at line 166 of file table_walker.hh.

References gem5::bits(), data, panic, and supersection().

◆ secure()

bool gem5::ArmISA::TableWalker::L1Descriptor::secure ( bool  have_security,
WalkerState currState 
) const
inlinevirtual

Returns true if this entry targets the secure physical address map.

Implements gem5::ArmISA::TableWalker::DescriptorBase.

Definition at line 238 of file table_walker.hh.

References gem5::bits(), gem5::ArmISA::TableWalker::currState, data, PageTable, gem5::ArmISA::TableWalker::WalkerState::secureLookup, and type().

Referenced by gem5::ArmISA::TableWalker::L2Descriptor::secure().

◆ setAp0()

void gem5::ArmISA::TableWalker::L1Descriptor::setAp0 ( )
inline

Set access flag that this entry has been touched.

Mark the entry as requiring a writeback, in the future.

Definition at line 222 of file table_walker.hh.

References _dirty, and data.

◆ shareable()

bool gem5::ArmISA::TableWalker::L1Descriptor::shareable ( ) const
inlinevirtual

If the section is shareable.

See texcb() comment.

Reimplemented from gem5::ArmISA::TableWalker::DescriptorBase.

Definition at line 214 of file table_walker.hh.

References gem5::bits(), and data.

◆ supersection()

bool gem5::ArmISA::TableWalker::L1Descriptor::supersection ( ) const
inline

Is the page a Supersection (16 MiB)?

Definition at line 144 of file table_walker.hh.

References gem5::bits(), and data.

Referenced by gem5::ArmISA::TableWalker::doL1Descriptor(), paddr(), and pfn().

◆ texcb()

uint8_t gem5::ArmISA::TableWalker::L1Descriptor::texcb ( ) const
inlinevirtual

Memory region attributes: ARM DDI 0406B: B3-32.

These bits are largly ignored by M5 and only used to provide the illusion that the memory system cares about anything but cachable vs. uncachable.

Reimplemented from gem5::ArmISA::TableWalker::DescriptorBase.

Definition at line 208 of file table_walker.hh.

References gem5::bits(), and data.

◆ type()

EntryType gem5::ArmISA::TableWalker::L1Descriptor::type ( ) const
inline

Definition at line 138 of file table_walker.hh.

References data.

Referenced by gem5::ArmISA::TableWalker::doL1Descriptor(), and secure().

◆ xn()

bool gem5::ArmISA::TableWalker::L1Descriptor::xn ( ) const
inlinevirtual

Is the translation not allow execution?

Implements gem5::ArmISA::TableWalker::DescriptorBase.

Definition at line 180 of file table_walker.hh.

References gem5::bits(), and data.

Member Data Documentation

◆ _dirty

bool gem5::ArmISA::TableWalker::L1Descriptor::_dirty

This entry has been modified (access flag set) and needs to be written back to memory.

Definition at line 115 of file table_walker.hh.

Referenced by dirty(), and setAp0().

◆ data

uint32_t gem5::ArmISA::TableWalker::L1Descriptor::data

The documentation for this class was generated from the following file:

Generated on Tue Sep 21 2021 12:28:42 for gem5 by doxygen 1.8.17